Horn



H, HUEBER May 1s, 1933.

HORN

Filed April 5. 19:52

INVENTOR BY @lary/ide@ wvwf, ATToRNEYi Patented May 16, 1933 UNITED STATES vPATENT OFFICE HENRY HUEBER, or BFFALO, NEW YORK, AssIGNoR 'ro TRIGO PRODUCTS y CORPORATION, BUFFALO, NEV vYORK HORN Applicationled Apr-i1 5, 1932. Serial No. 603,427.Y

My invention relates to a fluid pressure operable horn for giving a warning note orv signal, the device being particularly adapt- 'ed for such' use on an automobile, boat or like vehicle.

More particularly, my invention relates to such a device, of the type having an elongated trumpet passage connected to a sound box, the latter containing a Huid pressure .10 actuated valve for intermittently interrupting the passage of fluid through the sound box and trumpet passage, whereby sound waves are created and emitted from the `trumpet passage. The valve, ,which` is caused to oscillate rtoward and away` from its seat at high frequencies by the diderential iiuid pressures effective against itsopposite faces, is, according to the present invention, su ported by helical spring means, the axis o of oscillation of the valve. This permits of a simplified arrangement of parts and allows thecomparative free angular movement of the valve, whereby the latter may seat properly. Y

These and other objects and advantages including those inherent in the formation and arrangement of the component parts of the device, willlbecome apparent from the following description of the typical embodiment of the invention illustrated in the accompanying drawing, wherein: Fig. 1 isan elevation off a complete horn, including the trumpet, sound box and fluid pressure conduit;

. Fig. 2 is an enlarged vertical section through the sound box and a portion of the trumpet depicted in Fig. 1; and

Fig. 3 is a perspective view of a spring supporting and centering part shown insection in Fig. 2. i,

As illustrated in the drawing, the horn comprises lan elongated and tapered tubular member or trumpet 11, preferably flared `or ..45 belled at its enlarged and open end 12.

`Connected to the reduced end of the trumpet is a hollow casingor sound box 13, comprisinga forward section 14 and a rear section 15. The forward section may be screw 5.0 threadedtothe trumpet and locke'dtherewhich is coaxial withA theV axis with by a lock nut 16( The casing section 15 is secured to casing section 14 in any suitable manner, as by screws indicated at 17, a gasket 18 being interposed between the casing sections. Extending lfrom the Vcasing 13 55 is a nipple 19 connecting a conduit 21 which may extend to a suction reservoir, the intake of an internal .combustion engine, or other suitable source of fluid: under presy sure different than atmospheric.

The casing 13 is provided on its interior with anannular valve seat 22, the latter being preferably, although not necesarily, concentric with the axes of `the trumpet passage and the opening`23, at, the forward end of casing 13, which forms a continuation of the trumpet passage. The inner edge of the valve. seat 22 is delineated by a well or recess 24, in the casing interior, terminating in an annular shoulder yor abutmentL 25. Against the latter, within the well 24 is disposed'a spring supporting member comprisin-g an annulus`26 with a rearwardly pro- 4jecting tubular hub 27 and spaced radial .projectionsj28 abuttingV the shoulder 25. 75

Telescoping over the hub 27 and abutting the annulus 26 is a coiled helical spring 29.

A fiber disc 31, constituting a valve normally closing against valve'seat22 of the casing, is secured between weighted hub parts 32 and 33 by a screw 34, the latter being coaxial` of the hub parts and the fiber disc. Hub part 32 extends into spring 29 and has a peripheral ange 35 abuttingthe end of the spring. Hub part'33 has, portion 36 85 entering a second helical spring 37 and a shoulder 38 abutting the end thereof. Spring 37 preferably is axially aligned with thehub parts, the disc, and spring 29, and itsend opposite the latter parts is seated with a cup 39.

Secured to lthe latter, or integral therewith, is a threaded shank 41 extending through a screw threaded opening 42 in a portion of therear wall of casing 13, the 'wallbeing reinforced bya boss 43 about the opening. 95

. The shank 41 may be adjusted axially by rotation to compress the springs 29 and 37, and, as the latter are compressechthe :disc 31,will be moved toward the seat 22. To secure thev shank in any position of longitudinal adjustment that is desired, a lock nut 44 is threaded over the shank against the boss 43. A cap 45, titted over the boss and encasing the lock nut and end of shank 41, serves to improve the appearance of the device and to prot-ect the threads of the shank.

To adjust the device `for operation, the shank 41 isrotatedY to so compress springs 29 and 37 that the disc l'jwiil exert a slight pressure upon seat 22. When this condition is attained the spring 37 will be compressed to a slightly greater degree than the spring 35, the pressure exerted by the disc upon the seat 22 being equal to 'the difference between the pressures exerted upon the @opposite faces :of the disc by the springs.

In operation when thus adjusted, air will be withdrawn from the casing interi-or ibetween :the disc Aand casing section 15, through the outlet port Ior opening in nipple 19 and the yconduit 21, to the source oik suction, thereby decreasing the fluid pressure effective against the rear face foi the dise to bclow atmospheric` Simultaneously, atmospheric pressure will be exerted :against the outer face of the disc (at the lett in Fig. 2.), and, when the difference in Vfluid pressures overcomes` the spring pressure urging the disc to its seat, the ydisc will unseat, or move to the right as the device Iis illustrated in Fig. 2. vlhereupon fluid under approximately atmospheric pressure will afdmitted through the inlet yopening` and port into the chamber' at the rear face of the disc, so fequalizing the pressure against `the rear face with the pressure effective lagainst the forward face, that the spring means will move'the valve toward its seat.'

Continued withdrawal 'of 1iiuid through conduit 21 will again cause a reduction oi fluid pressure on the rear Jface of the disc so that vatmospheric pressure against the l-orwa-rd face of the disc will again unseat the latter and the operating cycle will be repeated. Because ofthe eXtreme mobility of air, the cycles will recur at high frequencies, causing the air column in the trumpet and sound box to be alternately rarii-ed and compressed at simil-arly high frequencies,

thus effecting the emission from the trumpet.

It is preferred that the frequency 'of the sound Waves and frequency oi koscillation of the disc '31 be correlated with the natural period :of oscillation of the aircolumn within the trumpet so that maximum resonance `and volume of sounl may be obtained with minimum expenditure of energy, and this may be accomplished by varying themass of the dise assembly by varying the .sizes of the hubs 32 and and/or by adjusting the compression of the springs.

It will be understood that the device ma be easily assembled or disassembled, the asoiE sound waves sembly operations consisting of placing together the member 28, spring 29, the disc valve assembly, and the spring 37; of engaging these parts with the forward rcasing section 14; and then of attaching to the forward casing section, the rear casing section 15, to which the cup 319 and shank 41 have been attached. Y

t will be further understood vthat the device 'herein described and illustrated ismerely representative and illustrative of one preyerred manner of embodying the inventive principles involved, and that other embodinre'nts employing these principles may be made, within the purview of my invention.

What is claimed is:

1. In a fluid pressure operated horn, 'hollow casing having a pair 'of tluid ports therein, yan annuirar Valve seat between said ports, said casing having a shouldered recess extending from saidv seat to one port, a spider having a 'tubular hub seated in the recess in abutment with the shoulder thereof, a cup havingVV :a threaded shankexten'ding through a 4threaded opening in the Icasing, a fiber disc normally abutting vthe .annular sea-t, said disc having Iaimularly shouldered hub parts on the opposite tace thereof; a coiled spring between the spider and disc, and a second coiled spring between the disc and the cupfsaid firstA spring being seated over the tubular hu-b of the spider and extending over one hub par-t in labutment with the annular tshoulder thereof, and the `second spring err-tending over the other hub part in abutment with the annular shoulder thereof and sea-tf'ng Within said cup.

2. In a. Hui-d ,pressure 4operated horn, 4a hollow casing having a pair of Huid ports therein and an annular valve seat between said ports, sai-d casing having a recess extending from said seat to one port, a member having an opening therethrough and Abeing` seated in said recess, a'valve normally abu tin-g the annular seat, a spring seating part carried by the casing, a member having spring seating means, land the valve having spring seating means on each face thereof,

and a pair of aligned springs, one spring be'- ing between the member and valve, land the other spring being between the valve and said spring seating part.

3. A fluid pressure operated horn comprising a chamber having an outlet port and an inlet port, a reciprocatory member `normally seating to close one port and adapt-ed to be reciprocated away and toward isaid one port when a Huid stream is rcaused to move through the'chamber from oneto the other of said portsa pair of compressed spring members disposed substantially in the line of reciprocation of the member yfor Vsupporting it, and means for adjusting the degree of Y ycompression of said spring members.

of reciprocation of the members for sup-V porting the member, and said springs being so Vcompressed that the member is normally held in a position closing said one port.-

5. In a fluid pressure operated horn, aY

hollow casing having a pair of ports therein, an annular valve seat between said ports, a vibratory member normally abutting said seat and having spring seating portions on the opposite faces thereof, a coil spring in engagement with each of said seating portions, said seating portions lbeing recessed and having annular walls for respectively receiving and preventing lateral displacement of the adjacent end convolutions of said springs, said springs being in substantially alignment and normally supporting said vibratory member in substantially closing relationship to said valve seat, and means extending from the Walls of the casing for supporting said springs.

6. In a fluid pressure operated horn, a

,hollow casing having a pair of ports therein and an annular valve seat between the ports,

the casing having a shouldered recess eX- tending from said seat into one of said ports, a spider seated in the recess in abutment with the shoulder thereof, a valve normally seated against said valve seat, a compressed spring between the spider and valve, a second spring atthe opposite side of the valve Y in alignment with the first spring, and

means carried by the casing for supporting the second spring, said means being adjustable to vary the tensions of the springs and to vary the pressure of the valve against the seat.

7. A fluid pressure operated horn compris ing a chamber having an outlet port and an inlet port, a reciprocatory member normally disposed in substantially closing relationship to one port and adapted to be reciprocated away and toward said one port when a fluid stream is caused to move through the chamber from one to the other' of said ports,.and a pair of compressed spring memsu portino it.

p C HENRY HUEBER. 

